Evolution of structure and magnetic properties in electron-doped double perovskites, Sr2−xLaxMnWO6 (0?x?1) |
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Authors: | Qisheng Lin Mark Croft |
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Affiliation: | a Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, Piscataway, NJ 08854, USA b Department of Physics, Rutgers, The State University of New Jersey, Piscataway, NJ 08854, USA |
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Abstract: | Powder neutron and X-ray diffraction studies show that the double perovskites in the region 0?x?1 exhibit two crystallographic modifications at room temperature: monoclinic P21/n and tetragonal I4/m, with a boundary at 0.75<x<0.9. Magnetic susceptibility measurements indicate that for x=0 and 0.5 Sr2−xLaxMnWO6 orders antiferromagnetically (AFM) at 15 and 25 K, respectively, for 0.75?x<1.0, a contribution of weak ferromagnetism (FM), probably due to canted-AFM order, increases with increasing x. The end point compound SrLaMnWO6 shows the strongest FM cluster effect; however, no clear evidence of magnetic order is discernable down to 4.2 K. X-ray absorption spectroscopy (XAS) confirms Mn2+ and mixed-valent W6+/5+ formal oxidation states in Sr2−xLaxMnWO6. |
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Keywords: | Sr2&minus xLaxMnWO6 Double perovskite Structure Neutron diffraction Magnetic properties |
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